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Nut size (A.K.A. diameter) is the size bolt that the nut is used with. The same is true of the thread count. Thus a 1/4"-20 nut fits a 1/4"-20 bolt.
For additional dimensional information click on an individual product number or see our US Nut Size Table.

Product # Diameter and Thread count Buy Each Buy Box Box Qty Buy Bulk Bulk Qty Coarse (standard) thread 2614 1/4"-20    $0.05       $1.95    100    $16.60    1000 2615 5/16"-18    $0.05       $2.70    100    $22.90    1000 2616 3/8"-16    $0.07       $4.10    100    $34.50    1000 2617 1/2"-13    $0.11       $3.56    50    $31.70    500 2618 5/8"-11    $0.18       $3.35    25    $29.90    250 2619 3/4"-10    $0.24       $4.38    20    $39.10    200 4299 7/8"-9    $0.55       $9.93    20    $88.90    200 4300 1"-8    $0.72       $12.98    20    $117.00    200 15141 1-1/4"-7    $1.93       $11.68    10    $105.00    100 15142 1-1/2"-6    $3.35       $20.32    10    $181.00    100

See also

Metric hex nuts

A standard six sided nut.